期刊
PHYSICAL REVIEW B
卷 87, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.214412
关键词
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资金
- CNRS-PICS
- Universite de Strasbourg
- EU Contract Integrated Infrastructure Initiative I3 in FP6 [R II 3 CT-2004-5060008]
- BESSY IA-SFS Access Program
- Agence Nationale de la Recherche in France via the project EQUIPEX UNION [ANR-10-EQPX-52]
- German Ministry of Education and Research BMBF [05K10PG2]
- Ministry of Education of Spain (Programa Nacional de Movilidad de Recursos Humanos del Plan Nacional) [I-D+ i 2008-2011]
Ultrafast magnetization dynamics induced by femtosecond laser pulses have been measured in ferrimagnetic Co0.8Gd0.2, Co0.74Tb0.26, and Co0.86Tb0.14 alloys. Using element sensitivity of x- ray magnetic circular dichroism at the Co L-3, Tb M-5, and Gd M-5 edges, we see that the demagnetization dynamics is element dependent. We show that a thermalization time as fast as 280 +/- 30 fs is observed for the rare earth in the alloy when the excited-state temperature is below the compensation temperature. It is limited to 500 +/- 100 fs when the excited-state temperature is below the Curie temperature (T-C). Therefore, for transition-metal rare-earth alloys, we propose that critical spin fluctuations in the vicinity of T-C reduce the demagnetization rates of the 4f electrons, whereas far from T-C the limited demagnetization rates should be avoided.
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